1. 31 12月, 2013 1 次提交
    • R
      ACPIPHP / radeon / nouveau: Fix VGA switcheroo problem related to hotplug · f244d8b6
      Rafael J. Wysocki 提交于
      The changes in the ACPI-based PCI hotplug (ACPIPHP) subsystem made
      during the 3.12 development cycle uncovered a problem with VGA
      switcheroo that on some systems, when the device-specific method
      (ATPX in the radeon case, _DSM in the nouveau case) is used to turn
      off the discrete graphics, the BIOS generates ACPI hotplug events for
      that device and those events cause ACPIPHP to attempt to remove the
      device from the system (they are events for a device that was present
      previously and is not present any more, so that's what should be done
      according to the spec).  Then, the system stops functioning correctly.
      
      Since the hotplug events in question were simply silently ignored
      previously, the least intrusive way to address that problem is to
      make ACPIPHP ignore them again.  For this purpose, introduce a new
      ACPI device flag, no_hotplug, and modify ACPIPHP to ignore hotplug
      events for PCI devices whose ACPI companions have that flag set.
      Next, make the radeon and nouveau switcheroo detection code set the
      no_hotplug flag for the discrete graphics' ACPI companion.
      
      Fixes: bbd34fcd (ACPI / hotplug / PCI: Register all devices under the given bridge)
      References: https://bugzilla.kernel.org/show_bug.cgi?id=61891
      References: https://bugzilla.kernel.org/show_bug.cgi?id=64891Reported-and-tested-by: NMike Lothian <mike@fireburn.co.uk>
      Reported-and-tested-by: <madcatx@atlas.cz>
      Reported-and-tested-by: NJoaquín Aramendía <samsagax@gmail.com>
      Cc: Alex Deucher <alexdeucher@gmail.com>
      Cc: Dave Airlie <airlied@linux.ie>
      Cc: Takashi Iwai <tiwai@suse.de>
      Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
      Cc: 3.12+ <stable@vger.kernel.org> # 3.12+
      f244d8b6
  2. 28 11月, 2013 1 次提交
  3. 22 11月, 2013 3 次提交
  4. 21 11月, 2013 22 次提交
  5. 20 11月, 2013 13 次提交